The average trophic efficiency of transfer of energy from one trophic level to the higher trophic level is called

$…A…$ is required for higher primary productivity. $…B…$ have the lowest primary productivity as the soil is deficient in moisture.

Choose the correct option for $\mathrm{A}$ and $\mathrm{B}$

The rate of formation of new organic matter by rabbit in a grassland, is called

Give an account of energy flow in an ecosystem

The number of individuals in each trophic level depends upon